Additive main effect and multiplicative interaction analysis of grain yield of wheat varieties in Lithuania
¹Lithuanian Institute of Agriculture, Department of Grass Breeding
²Department of Cereal Breeding. Stoties Street 2, Plant Breeding Centre, Akademija, LT-58344, Kedainiai distr. Lithuania
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Stability of 13 winter wheat (Triticum aestium L.) varieties across 4 locations and 2 years with respect to grain yield were tested in Lithuania. The analysis of variance of the 13 varieties in 8 environments shows that genotype (G), location (L), crop-year (Y) and their interaction were significant (P < 0.01) for winter wheat grain yield. Highly significant G x L effects indicated the necessity for testing wheat varieties in Lithuania at multiple locations. The article describes a previously used method and shows that AMMI (additive main effects and multiplicative interaction) model was effective for studying winter wheat genotype-environment interaction (GEI). The first bilinear AMMI model terms accounted for 76.8%. The biplot shows that the varieties Zentos, Compliment, LIA 3948, Elfas and Marshal are best suited for cultivation in a wide range of environments, while the varieties Cubus, Aristos, Marshal and LP.790.1.98 are best suited for cultivation in favourable conditions. The variety Meunier is well-suited for cultivation in poor environments. GEI patterns revealed by AMMI plots indicate that winter wheat varieties are narrowly adapted. No genotype has superior performance in all environments. The variety Elfas was the best at combining yield stability and productivity. The varieties Aristos, LP 790.1.98 and Marshal were more stable but lower yielding than Elfas.